Sofa



FIG. 1 is a front perspective view of a sofa, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof from the left of FIG. 2, the side elevational opposite that shown in FIG. 3 being the mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a sofa, as shown and described. 